I wasn't able to find specific documentation on A-frame ladders in our current safety knowledge base, but here are industry-standard safety guidelines:

1. Setup: Ensure the ladder is placed on a stable, level surface. Fully open the ladder and ensure that the spreaders are locked before climbing. 2. Climbing: Maintain three points of contact (two hands and one foot, or two feet and one hand) at all times when ascending or descending. Do not climb higher than the second step from the top. 3. General Safety: Be aware of overhead obstructions and crushing hazards. Keep all body parts inside the aerial platform.